WO2012086532A1 - 表示装置 - Google Patents
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- WO2012086532A1 WO2012086532A1 PCT/JP2011/079141 JP2011079141W WO2012086532A1 WO 2012086532 A1 WO2012086532 A1 WO 2012086532A1 JP 2011079141 W JP2011079141 W JP 2011079141W WO 2012086532 A1 WO2012086532 A1 WO 2012086532A1
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- luminance
- display
- main panel
- liquid crystal
- panel
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/34—Stereoscopes providing a stereoscopic pair of separated images corresponding to parallactically displaced views of the same object, e.g. 3D slide viewers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/22—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type
- G02B30/24—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type involving temporal multiplexing, e.g. using sequentially activated left and right shutters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/356—Image reproducers having separate monoscopic and stereoscopic modes
- H04N13/359—Switching between monoscopic and stereoscopic modes
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
- G02F1/294—Variable focal length devices
Definitions
- the present invention relates to a display device having a switch panel capable of switching image display between two-dimensional display and three-dimensional display.
- a display device having a switch panel capable of switching an image display between a two-dimensional display and a three-dimensional display has two liquid crystal panels arranged to face each other as disclosed in, for example, Japanese Patent Laid-Open No. 5-122733.
- the display device displays an image on one liquid crystal panel (main panel), and displays a black and white barrier stripe image on the other liquid crystal panel (switch panel).
- the other liquid crystal panel functions as a parallax barrier, and an image displayed on one liquid crystal panel is visually recognized as a three-dimensional stereoscopic image. If the barrier / striped image is not displayed on the other liquid crystal panel, the image displayed on the one liquid crystal panel is visually recognized as it is, so that a two-dimensional image display is obtained.
- the luminance of the light source such as the backlight is reduced in the case of the two-dimensional display so that the luminance of the display screen seen from the viewer side is approximately the same in the case of the two-dimensional display and the case of the three-dimensional display.
- a method of matching the brightness in the case of three-dimensional display can be considered.
- the luminance of the light source changes rapidly in response to switching between the two-dimensional display and the three-dimensional display.
- the switch panel is a liquid crystal panel
- the two-dimensional display and the three-dimensional display are switched. It is difficult to suddenly change the alignment state of the liquid crystal molecules in accordance with the switching. Then, when switching between the two-dimensional display and the three-dimensional display, an unnatural luminance change occurs on the display screen due to a timing difference between the luminance change of the light source and the change in the state of the liquid crystal, and the viewer feels uncomfortable. There is.
- An object of the present invention is to provide a display device having a switch panel capable of switching between two-dimensional display and three-dimensional display of an image, so that the viewer feels uncomfortable when switching between the two-dimensional display and the three-dimensional display. This is to prevent such an unnatural luminance change from occurring.
- a display device includes a main panel that displays an image, a two-dimensional mode that is arranged to face the main panel and visually recognizes an image displayed on the main panel as a two-dimensional image, A switch panel that can be switched to a three-dimensional mode for viewing the image stereoscopically, a brightness control unit that changes the brightness of the main panel when the mode is switched by the switch panel, and mode switching by the switch panel And a visual correction unit that makes it difficult to visually recognize the luminance change of the main panel on the visual recognition side.
- the display device prevents an unnatural luminance change that causes the viewer to feel uncomfortable when the image display is switched between the two-dimensional display and the three-dimensional display. it can.
- FIG. 1 is a diagram showing a schematic configuration of a liquid crystal display device according to Embodiment 1 of the present invention.
- FIG. 2 is a cross-sectional view showing a schematic configuration of the switch panel.
- FIG. 3 is a diagram illustrating an example of a change in luminance of the display screen when switching from the three-dimensional display to the two-dimensional display when the screen is viewed from the normal direction.
- FIG. 4 is a diagram schematically illustrating the movement of liquid crystal molecules in the liquid crystal layer when switching from the three-dimensional display to the two-dimensional display.
- FIG. 5 is a diagram illustrating an example of a change in luminance of the display screen when switching from the three-dimensional display to the two-dimensional display when the screen is viewed from the viewing angle direction.
- FIG. 1 is a diagram showing a schematic configuration of a liquid crystal display device according to Embodiment 1 of the present invention.
- FIG. 2 is a cross-sectional view showing a schematic configuration of the switch panel.
- FIG. 3 is
- FIG. 6 is a diagram illustrating an example of a change in luminance of the display screen when switching from the two-dimensional display to the three-dimensional display when the screen is viewed from the normal direction.
- FIG. 7 is a block diagram illustrating a schematic configuration of a visual correction unit of the liquid crystal display device according to the first embodiment.
- FIG. 8 is a diagram illustrating an example of the luminance of the backlight corrected by the luminance correction of the visual recognition correction unit.
- FIG. 9 is a diagram illustrating an example of the luminance of the display screen after the luminance correction.
- FIG. 10 is a block diagram illustrating a schematic configuration of a visual correction unit according to a modification of the first embodiment.
- FIG. 11 is a block diagram illustrating a schematic configuration of a visual correction unit of the liquid crystal display device according to the second embodiment.
- FIG. 12 is a diagram schematically illustrating an example of a case where the luminance change of the display screen due to the response delay of the liquid crystal is hidden by the black display of the screen.
- FIG. 13 is a block diagram illustrating a schematic configuration of a visual correction unit of the liquid crystal display device according to the third embodiment.
- FIG. 14 is a diagram illustrating an example of a case where the display screen luminance change due to the response delay of the liquid crystal is hidden by backlight luminance adjustment.
- FIG. 15 is a cross-sectional view illustrating a schematic configuration of a switch panel of the display device according to the third embodiment.
- a display device includes a main panel that displays an image, a two-dimensional mode that is arranged to face the main panel and visually recognizes an image displayed on the main panel as a two-dimensional image, A switch panel that can be switched to a three-dimensional mode for viewing the image stereoscopically, a brightness control unit that changes the brightness of the main panel when the mode is switched by the switch panel, and mode switching by the switch panel And a visual correction unit that makes it difficult to visually recognize the luminance change of the main panel on the visual recognition side (first configuration).
- the luminance control unit switches the luminance of the main panel, and the visual correction unit makes it difficult to visually recognize the luminance change on the viewer side. can do. Therefore, it is possible to switch between the two-dimensional display and the three-dimensional display without giving the viewer a sense of incongruity.
- the luminance means the luminous intensity per unit surface area of the light emitter when the light emitter is viewed.
- the luminance of the main panel means the luminous intensity per unit surface area of the main panel when the main panel is viewed when the main panel itself emits light.
- the luminance of the main panel means the luminous intensity per unit surface area of the main panel when viewing the display surface of the main panel.
- the brightness of the display screen means the luminous intensity per unit surface area of the screen located closest to the viewing side when viewing the display screen of the display device.
- the visual correction unit is configured to change the luminance of the main panel so that the luminance change of the main panel is not easily seen from the visual recognition side when the mode is switched by the switch panel. It is preferable (2nd structure).
- the second configuration preferably further includes a light source unit that emits light to the main panel, and the visual correction unit is configured to change a luminance of the light source unit. 3 configuration).
- the luminance of the light source unit means the luminous intensity per unit surface area when the light source unit is visually recognized.
- the visual correction unit adjusts the luminance of the main panel so that the luminance of the display screen viewed from the visual side becomes constant when the mode is switched by the switch panel. It is preferable to be configured as described above (fourth configuration).
- the visual correction unit includes a temperature detection unit that detects an ambient temperature, and a correction value for correcting the luminance of the main panel according to the ambient temperature.
- the correction value storage unit stores the correction value stored in the correction value storage unit according to the ambient temperature detected by the temperature detection unit and the brightness of the main panel using the correction value It is preferable to have a luminance correction unit that corrects (fifth configuration).
- the correction value storage unit stores a luminance correction value corresponding to the ambient temperature. For this reason, it is possible to read a correction value corresponding to the ambient temperature from the correction value storage unit and correct the luminance of the main panel by the luminance correction unit. Thereby, the luminance change of the display screen at the time of switching between the two-dimensional display and the three-dimensional display becomes difficult to be visually recognized on the viewer side. Therefore, switching between the two-dimensional display and the three-dimensional display can be performed without giving the viewer a sense of incongruity.
- the visual correction unit is based on a luminance detection unit that detects luminance on the visual recognition side of the display screen and the luminance detected by the luminance detection unit. It is preferable to have a luminance adjusting unit that adjusts the luminance of the main panel (sixth configuration).
- the luminance of the main panel is adjusted according to the luminance on the viewing side of the display screen, the luminance change on the display screen at the time of switching between the two-dimensional display and the three-dimensional display is less likely to be visually recognized by the viewer. Therefore, switching between the two-dimensional display and the three-dimensional display can be performed without giving the viewer a sense of incongruity.
- the visual correction unit is configured to change a gradation of an image displayed on the main panel so that a change in luminance of the main panel is difficult to be visually recognized from the visual side. Is preferable (seventh configuration). Thereby, when switching between the two-dimensional display and the three-dimensional display, it is possible to prevent the viewer from visually recognizing the luminance change on the display screen that gives a sense of incongruity.
- the visual correction unit may prevent the luminance change of the main panel from being viewed from the viewer side when the mode is switched by the switch panel.
- the display screen is preferably changed to a black state (eighth configuration).
- the display screen becomes black display (black state), so an unnatural display screen at the time of switching between 2D display and 3D display. Can be prevented from being visually recognized by a viewer. Therefore, switching between the two-dimensional display and the three-dimensional display can be performed without giving the viewer a sense of incongruity.
- the black state includes not only a completely dark state where the luminance of the display screen is almost zero, but also a small luminance that does not allow a change in the luminance of the display screen when switching between the two-dimensional display and the three-dimensional display.
- the display correction unit sets the display screen to a black state
- the luminance of the main panel is increased after the display panel is set to a black state by gradually decreasing the luminance of the main panel. It is preferable to be configured to increase gradually (9th configuration).
- the display screen when switching between 2D display and 3D display by the switch panel, the display screen can be made black without any discomfort, and switching between 2D display and 3D display can be performed without any discomfort. be able to.
- the switch panel preferably includes a liquid crystal layer and a pair of electrodes disposed so as to sandwich the liquid crystal layer (tenth embodiment). Configuration).
- the liquid crystal layer functions as a liquid crystal lens when a voltage is applied to the pair of electrodes (an eleventh configuration).
- the switch panel functions as a liquid crystal lens
- the liquid crystal layer becomes thick, so that the luminance change due to the response delay of the liquid crystal when switching between the two-dimensional display and the three-dimensional display becomes more remarkable. Therefore, in such a configuration, a more remarkable effect can be obtained by applying the above-described first to ninth configurations.
- the dimension of the structural member in each figure does not represent the dimension of an actual structural member, the dimension ratio of each structural member, etc. faithfully.
- FIG. 1 shows a schematic configuration of a liquid crystal display device 1 (display device) according to an embodiment of the present invention.
- the liquid crystal display device 1 is formed by stacking a plurality of members in the thickness direction.
- the liquid crystal display device 1 includes a main panel 2 that displays an image, a switch panel 3 that displays a slit-shaped black and white image (stripe image), and the main panel 2 and the switch panel 3 sandwiched therebetween.
- the liquid crystal display device 1 includes a backlight 7.
- a polarizing plate 4 As shown in FIG. 1, in the liquid crystal display device 1, a polarizing plate 4, a main panel 2, a polarizing plate 5, a switch panel 3, a polarizing plate 6, and a backlight 7 (light source) are sequentially arranged from the viewing side (front side in FIG. 1). Part) is laminated.
- the polarizing plate 5 serves as both a polarizing plate disposed on the back side of the main panel 2 and a polarizing plate disposed on the viewing side of the switch panel 3.
- the backlight 7 for example, a direct type, an edge light type, or a planar light source type can be used.
- a light source of the backlight 7 a cold cathode tube, a light emitting diode (LED), etc. can be used, for example.
- the liquid crystal display device 1 forms a parallax barrier by displaying a stripe image on the switch panel 3, and the right-eye image among the images displayed on the main panel 2 is only for the right eye and the left eye.
- This is a so-called parallax barrier type three-dimensional image display device in which the image for viewing is visible only to the left eye. Therefore, the main panel 2 displays the left-eye image and the right-eye image on one screen in synchronization with the display of the stripe image on the switch panel 3.
- the liquid crystal display device 1 according to this embodiment is used as a two-dimensional image display device, the display of the switch panel 3 is stopped and the switch panel 3 is made transparent. That is, the switch panel 3 is configured to be switchable between a three-dimensional mode for displaying the image of the main panel 2 as a three-dimensional image and a two-dimensional mode for displaying the image as a two-dimensional image.
- the main panel 2 is, for example, a VA (Vertical Alignment) type liquid crystal panel.
- the main panel 2 includes an active matrix substrate in which a large number of pixels are arranged in a matrix, and a counter substrate disposed to face the active matrix substrate.
- the main panel 2 includes a liquid crystal layer capable of switching between a birefringent state of light and a light transmission state between the active matrix substrate and the counter substrate.
- the main panel 2 may be a liquid crystal panel other than the VA type.
- the active matrix substrate has a plurality of TFTs (Thin Film Transistor, not shown), a pixel electrode, and a plurality of wirings (source wiring, gate wiring, etc.) on a transparent substrate such as a glass substrate. . Since the TFT is the same as the conventional one, detailed description is omitted.
- the pixel electrode is a transparent electrode and is formed of a light-transmitting conductive material such as ITO (indium tin oxide).
- the pixel electrodes are spaced apart from each other for each pixel.
- the pixel electrode defines a pixel as a unit of image display.
- the source electrode, the gate electrode, and the drain electrode of the TFT are connected to the source wiring, the gate wiring, and the pixel electrode, respectively.
- the point that a TFT is driven by inputting a signal to the TFT through the gate wiring and the source wiring is the same as that of the conventional liquid crystal display device, and thus detailed description is omitted.
- the counter substrate is obtained by providing a counter electrode made of a transparent conductive film such as ITO on a transparent substrate such as a glass substrate.
- the counter substrate is provided with RGB color filters.
- the liquid crystal layer by controlling the electric field applied to the liquid crystal layer, that is, the voltage applied between the counter electrode and the pixel electrode, the liquid crystal layer causes the light transmission state and the light to be birefringent.
- the state can be switched in units of pixels. That is, by controlling the application of an electric field to the liquid crystal layer by the TFT, a region where light passes through the light transmission region of the liquid crystal layer and is colored by the color filter is displayed as a color image.
- the color filter is provided on the counter substrate.
- the present invention is not limited to this, and a configuration without a color filter may be used.
- the switch panel 3 is, for example, a TN (Twisted Nematic) type liquid crystal panel.
- TN Transmission Nematic
- a stripe image displayed on the switch panel 3 can be displayed with a higher contrast than other types of liquid crystal panels. Therefore, the liquid crystal display device 1 according to the present embodiment can display a three-dimensional image with high display quality.
- the switch panel 3 includes a substrate 21 on which electrodes are formed in a slit shape, and a counter substrate 22 arranged to face the substrate 21 (see FIG. 2).
- the switch panel 3 includes a liquid crystal layer 23 between the substrate 21 and the counter substrate 22 that can be switched between a state of rotating light and a light transmission state.
- the three-dimensional mode is realized by forming the light transmission state region in the liquid crystal layer 23 in a stripe shape.
- the switch panel 3 by rotating the light in the entire area of the liquid crystal layer 23, the switch panel 3 becomes transparent and becomes a two-dimensional mode.
- Alignment films 21a and 22a are provided on the surfaces of the substrate 21 and the counter substrate 22 on the liquid crystal layer 23 side, respectively.
- the alignment films 21a and 22a are subjected to a rubbing process in which the surface is rubbed in one direction with a cloth or the like.
- the alignment films 21a and 22a of the substrate 21 and the counter substrate 22 have a rubbing direction of the alignment film 21 a provided on the substrate 21 and a rubbing direction of the alignment film 22 a provided on the counter substrate 22 from the viewing side. It is rubbed so as to be shifted by about 90 degrees.
- the liquid crystal molecules in the liquid crystal layer 23 can be arranged in a twisted state so as to have an angle difference of 90 degrees between the substrate 21 side and the counter substrate 22 side. Therefore, the switch panel 3 functions as a TN liquid crystal panel.
- the substrate 21 of the switch panel 3 is not limited to the above-described configuration as long as it can display a stripe image on the switch panel 3.
- any substrate such as an active matrix substrate in which a large number of pixels are arranged in a matrix form may be used. Such a configuration may be adopted.
- the brightness of the display screen of the liquid crystal display device (the screen positioned closest to the viewing side) is smaller in the case of three-dimensional display than in the case of two-dimensional display. Therefore, when the display of the image on the liquid crystal display device is switched between the two-dimensional display and the three-dimensional display, the luminance of the display screen may change, and the viewer may feel uncomfortable.
- the brightness of the backlight 7 is reduced so as to be approximately the same as the brightness of the display screen in the case of three-dimensional display when viewed from the viewing side. Can be considered.
- the brightness of the display screen can be made comparable between the two-dimensional display and the three-dimensional display, and the viewer is greatly discomfort when switching between the two-dimensional display and the three-dimensional display. Can be prevented.
- the luminance of the backlight 7 when the luminance of the backlight 7 is changed in the case of two-dimensional display as described above, the luminance of the backlight 7 changes almost simultaneously with switching between the two-dimensional display and the three-dimensional display.
- the orientation of the liquid crystal in the switch panel 3 does not change instantaneously.
- the switch panel 3 composed of TN liquid crystal when the switch panel 3 is changed from the three-dimensional mode to the two-dimensional mode, that is, when the electric field applied to the liquid crystal of the switch panel 3 is set to zero, the backflow phenomenon described later. This phenomenon occurs.
- the movement of the liquid crystal molecules fluctuates during the realignment of the liquid crystal molecules, and the luminance of the main panel 2 greatly fluctuates several times.
- luminance of the main panel 2 appears also as a brightness
- FIG. 3 shows an example of a change in luminance of the display screen when switching from 3D display to 2D display.
- 3D display 3D in the figure, the same in the following description
- 2D display 2D in the figure, the same in the following description
- the luminance of the backlight 7 is changed. If not, the brightness of the display screen increases (broken line in the figure).
- the luminance of the display screen can be made comparable between the three-dimensional display and the two-dimensional display (solid line in the figure).
- the above-described backflow phenomenon will be described in detail with reference to FIGS.
- the liquid crystal molecules 23a stand in the liquid crystal layer 23 (the major axis direction of the liquid crystal molecules 23a is the thickness direction of the liquid crystal layer 23). State).
- the angle formed by the alignment films 21a and 22a and the liquid crystal molecules 23a is increased, so that the strain energy is increased. Therefore, when the electric field applied to the liquid crystal layer 23 is zero, as shown in FIG.
- the liquid crystal molecules 23a in the vicinity of the alignment films 21a and 22a try to re-align at the moment when the electric field is zero, A flow of liquid crystal is generated (the luminance of the display screen at this time is I in FIG. 3).
- the liquid crystal molecules 23a that are located inside the liquid crystal layer 23 and have not yet started moving are moved back by the movement of the realignment of the liquid crystal molecules 23a in the vicinity of the alignment films 21a and 22a. It will move in the opposite direction to returning to the orientation (state of FIG. 4D).
- the transmittance of the liquid crystal layer 23 is rapidly lowered, and the luminance of the display screen is lowered.
- the bounding of the transmittance is gradually ended, and the transmittance of the liquid crystal layer 23 is stabilized.
- the brightness of the display screen is also constant (III in FIG. 3).
- the liquid crystal molecules 23a are gradually twisted in the thickness direction of the liquid crystal layer 23 when viewed from the viewing direction.
- the liquid crystal molecules 23a are simplified to simplify the illustration. The twist of is omitted.
- FIG. 3 The luminance change shown in FIG. 3 is an example when viewed from the normal direction with respect to the screen.
- FIG. 5 shows the luminance change of the display screen.
- the 6 o'clock direction is the viewing angle direction, but the viewing angle direction varies depending on the rubbing direction of the switch panel 3.
- the brightness of the display screen varies depending on the viewing direction of the screen of the liquid crystal display device.
- the viewpoint when viewing the three-dimensional image is viewed from the normal direction in the center of the screen of the liquid crystal display device.
- the viewpoint will be described with reference to an example of the viewpoint.
- the viewpoint of the three-dimensional image may be a viewpoint from a direction other than the normal direction at the center of the screen, and the luminance correction described later may be corrected not only from the viewpoint of the three-dimensional image but also from other viewpoints. .
- the luminance change of the display screen is greatly influenced by the behavior of the liquid crystal molecules 23a of the switch panel 3. Therefore, the brightness of the display screen varies greatly depending on the ambient temperature (the ambient temperature of the liquid crystal display device 1) that affects the movement of the liquid crystal molecules 23a. Therefore, the change in luminance of the display screen shown in FIGS. 3 and 5 changes under the influence of the ambient temperature.
- the examples shown in FIGS. 3 and 5 are cases where the ambient temperature is 25 ° C.
- the backflow phenomenon as described above occurs only when the electric field applied to the switch panel 3 is made zero, that is, when the image display is switched from the three-dimensional display to the two-dimensional display.
- the movement of the liquid crystal molecules is slow with respect to the change in the luminance of the backlight 7, so that the luminance of the display screen varies as shown in FIG.
- FIG. 6 is an example of a luminance change at the viewpoint of the above-described three-dimensional image.
- the backflow phenomenon does not occur as in the case of switching from the three-dimensional display to the two-dimensional display (FIGS. 3 and 5). Is considerably shorter than the case of switching from 3D display to 2D display.
- the electric field applied to the liquid crystal is set to zero and the liquid crystal molecules wait for the natural alignment to return to the original orientation, whereas when switching from 2D display to 3D display.
- the liquid crystal switching time is shortened because an electric field is applied to the liquid crystal to control the alignment of the liquid crystal molecules.
- the luminance is corrected when switching between the two-dimensional display and the three-dimensional display so that the display screen does not cause a strange luminance change.
- the liquid crystal display device 1 controls the luminance of the backlight 7 in accordance with a luminance control unit 30 for controlling the luminance of the main panel 2 and a control signal output from the luminance control unit 30. And a backlight control unit 35.
- the liquid crystal display device 1 also includes a display switching unit 36 that outputs a signal to the luminance control unit 30 when switching between two-dimensional display and three-dimensional display, and a luminance control unit that detects the ambient temperature of the liquid crystal display device 1.
- 30 includes a temperature detection unit 37 that outputs a signal.
- the luminance control unit 30 changes the luminance of the backlight 7 to the backlight control unit 35 when a signal indicating that switching between the two-dimensional display and the three-dimensional display is performed from the display switching unit 36.
- Control signal for output Specifically, when a signal indicating that the display switching unit 36 has switched to the three-dimensional display is input from the display switching unit 36, the luminance control unit 30 outputs a control signal that increases the luminance of the backlight 7.
- the luminance control unit 30 outputs a control signal that decreases the luminance of the backlight 7. Thereby, the luminance control unit 30 can change the luminance of the main panel 2.
- the luminance control unit 30 stores a luminance correction unit 31 that outputs a correction signal for correcting the luminance of the backlight 7, and a luminance correction value corresponding to the ambient temperature detected by the temperature detection unit 37.
- a correction value storage unit 32 storing a luminance correction unit 31 that outputs a correction signal for correcting the luminance of the backlight 7, and a luminance correction value corresponding to the ambient temperature detected by the temperature detection unit 37.
- the luminance correction unit 31 is configured to read out a luminance correction value from the correction value storage unit 32 in accordance with the ambient temperature detected by the temperature detection unit 37 and output it as a control signal to the backlight control unit 35.
- the luminance correction unit 31 and the correction value storage unit 32 together with the temperature detection unit 37 constitute a visual correction unit 10.
- the visual correction unit 10 may include configurations other than the luminance correction unit 31, the correction value storage unit 32, and the temperature detection unit 37.
- the correction value stored in the correction value storage unit 32 is, for example, a change in luminance of the display screen (main panel) due to the operating characteristics of the liquid crystal at each temperature when viewed from the normal direction to the screen (FIG. 3).
- a luminance change of 2 is a value (or function) that makes almost zero.
- An example when the brightness of the backlight 7 is corrected by the correction value is shown in FIG.
- the luminance of the backlight 7 shown in FIG. 8 is set to a value that makes the luminance change of the display screen shown by the broken line in FIG. 9 constant as shown by the solid line in FIG. Therefore, by using a correction value so that the luminance of the backlight 7 becomes the luminance shown in FIG.
- the luminance change of the display screen can be made almost zero (constant luminance) as shown by the solid line in FIG. .
- the correction value is set so that the luminance change of the display screen at the time of switching from the three-dimensional display to the two-dimensional display becomes almost zero.
- the correction value may be set so that the luminance change of the display screen is reduced.
- the correction value (or function) stored in the correction value storage unit 32 may be a value such that the luminance change of the display screen when viewed from another direction with respect to the screen is almost zero. However, it may be a value that reduces the change in luminance of the display screen when viewed from a plurality of directions.
- the backlight control unit 35 controls the backlight 7 so as to change the luminance of the backlight 7.
- the backlight 7 is constituted by an LED
- the luminance of the backlight 7 is controlled by controlling the current supplied to the LED.
- the control method of the backlight 7 is not limited to the above-described method.
- the luminance of the backlight 7 is corrected according to the ambient temperature when switching between the two-dimensional display and the three-dimensional display. Therefore, even when the liquid crystal characteristic of the switch panel 3 changes according to the ambient temperature, the luminance of the backlight 7 can be changed according to the change of the characteristic. Therefore, it is possible to more reliably reduce the change in luminance of the display screen when switching between the two-dimensional display and the three-dimensional display. Therefore, it is possible to prevent the viewer from feeling uncomfortable when switching between the two-dimensional display and the three-dimensional display.
- FIG. 10 shows a modification of the first embodiment.
- the configuration of this modified example is different from the configuration of the first embodiment described above in that the luminance is corrected according to the luminance of the display screen.
- the same components as those in the first embodiment are denoted by the same reference numerals, and only different parts will be described below.
- the liquid crystal display device includes a luminance control unit 40, a backlight control unit 35, a display switching unit 36, and a luminance detection unit 42.
- the luminance control unit 40 is configured to control the luminance of the backlight 7 in accordance with switching between two-dimensional display and three-dimensional display.
- the luminance control unit 40 includes a luminance adjustment unit 41 that adjusts the luminance of the backlight 7 in accordance with the luminance of the display screen detected by the luminance detection unit 42.
- the luminance adjustment unit 41 generates a correction signal so that the luminance of the display screen detected by the luminance detection unit 42 substantially matches the target value, with the luminance of the display screen in the case of two-dimensional display as a target value.
- This correction signal is output to the backlight control unit 35. Thereby, the luminance of the backlight 7 is adjusted by the backlight control unit 35.
- the luminance detection unit 42 is configured by, for example, a photosensor provided on the viewing side of the liquid crystal display device.
- the luminance detection unit 42 is provided at a position where the luminance of the display screen on the viewing side in the liquid crystal display device can be detected.
- the visual adjustment unit 11 is configured by the luminance adjustment unit 41 and the luminance detection unit 42.
- the visual recognition correction unit 11 may include a configuration other than the luminance adjustment unit 41 and the luminance detection unit 42.
- FIG. 11 shows a configuration for reducing the uncomfortable feeling of luminance change of the main panel 2 that occurs when switching between two-dimensional display and three-dimensional display in the liquid crystal display device according to the second embodiment. Since the basic configuration of the liquid crystal display device is the same as that of the first embodiment, description of the configuration of the liquid crystal display device is omitted.
- the liquid crystal display device includes a display switching unit 36 similar to that of the first embodiment and a correction signal for changing the image to black display (black state) at the time of display switching.
- a display correction unit 51 (visual correction unit) for outputting and a display control unit 56 for outputting an image data signal in accordance with the correction signal are provided.
- the liquid crystal display device also includes a luminance control unit that outputs a control signal to the backlight control unit 35.
- the display control unit 56 is configured to output an image data signal for displaying an image on the main panel 2 to a source driver (not shown).
- a source driver (not shown).
- the image data signal output from the display control unit 56 is input to a source driver (not shown).
- the source driver generates and outputs a gradation display signal based on the input image data signal.
- This gradation display signal is supplied to each pixel of the main panel 2 via a source line (not shown). As a result, a black image is displayed on the main panel 2.
- the display correction unit 51 When the display correction unit 51 receives a signal for switching between the two-dimensional display and the three-dimensional display from the display switching unit 36, the display correction unit 51 outputs a correction signal for performing black display to the display control unit 56. That is, when the display correction unit 51 switches between the two-dimensional display and the three-dimensional display, the display control unit 56 receives a low gradation (for example, a black display) while the luminance fluctuates unnaturally. A correction signal that outputs an image data signal of (zero level gradation) is output.
- the display correction unit 51 includes a timer unit 52 that counts the output time of a correction signal for black display.
- the predetermined time is set to be equal to or longer than the time when the luminance change of the main panel 2 causes the viewer to feel uncomfortable when switching between the two-dimensional display and the three-dimensional display.
- the predetermined time may be set to the longest time among the switching times of the switch panel 3 assumed in the liquid crystal display device, or may be changed according to the ambient temperature.
- the image is displayed in black for a predetermined time, so that it is possible to prevent the luminance fluctuation of the main panel 2 from being visually recognized during the switching time of the switch panel 3. Therefore, it is possible to prevent a viewer from visually recognizing a change in luminance of the main panel 2 that gives a sense of discomfort when switching between the two-dimensional display and the three-dimensional display.
- the solid line in FIG. 12 has shown the luminance change of the display screen.
- the display correction unit 51 gradually reduces the brightness of the display screen to black display when the image is displayed in black, and gradually from the black display state. Further, it may be configured to be able to realize a fade-in in which the luminance of the display screen is increased to return to the original luminance.
- the display correction unit 51 may be configured to perform only one of fade-out and fade-in.
- the black display is not only in the case where the brightness is completely reduced to zero and not in a black state, but the change in brightness of the main panel 2 at the time of switching between the two-dimensional display and the three-dimensional display cannot be visually recognized.
- the case of reducing the brightness of the display screen is also included. That is, in the present embodiment, the gradation of the image data signal output from the display control unit 45 is not limited to the zero level, and the luminance change of the main panel 2 at the time of switching between the two-dimensional display and the three-dimensional display cannot be visually recognized. It may be a gradation signal of a level that reduces the brightness of the display screen to a certain extent.
- FIG. 13 shows a configuration for reducing a sense of incongruity due to a change in luminance of the main panel 2 that occurs when switching between two-dimensional display and three-dimensional display in the liquid crystal display device according to the third embodiment.
- the configuration of this embodiment is different from the configuration of the second embodiment in that the display control unit in the above-described second embodiment is a backlight control unit and a black state is realized by the luminance of the backlight. Therefore, the basic configuration of the liquid crystal display device is the same as that of the above-described first embodiment, and thus the description of the configuration of the liquid crystal display device is omitted. Further, the same parts as those of the above-described second embodiment are denoted by the same reference numerals, and the description thereof is omitted.
- the liquid crystal display device includes a display switching unit 36, a luminance control unit 60, and a backlight control unit 35 that controls the backlight 7 as in the first embodiment.
- the luminance control unit 60 outputs a control signal for the backlight control unit 35 based on the signal output from the display switching unit 36.
- the luminance control unit 60 reduces the luminance of the backlight 7 so that an unnatural change in luminance of the main panel 2 is not visually recognized when switching between two-dimensional display and three-dimensional display. (Visual correction part).
- the display correction unit 61 has a timer unit 62 for counting the output time of the control signal.
- the timer 62 counts a predetermined time from the output start of the control signal, the signal output of the control signal from the display correction unit 61 is stopped. Thereby, like the second embodiment, the control signal can be output for a predetermined time.
- the control signal output from the display correction unit 61 is a signal that lowers the luminance of the backlight 7 and makes the screen black. Therefore, when the backlight control unit 35 receives this control signal, the screen of the liquid crystal display device becomes black, and the luminance change of the main panel 2 at the time of switching between the two-dimensional display and the three-dimensional display becomes difficult to be visually recognized.
- FIG. 14 shows a change in luminance of the backlight 7 when switching from the three-dimensional display to the two-dimensional display.
- a solid line in FIG. 14 after switching from the three-dimensional display to the two-dimensional display, the luminance of the backlight 7 is decreased for a predetermined time, thereby causing the main panel 2 caused by the backflow phenomenon of the switch panel 3. The luminance change is less visible.
- the alternate long and short dash line in FIG. 14 does not perform luminance correction by the display correction unit 61 as described above when switching from the three-dimensional display to the two-dimensional display, and simply performs the backlight 7 in the two-dimensional display. This is a case in which the luminance of is reduced compared to the case of three-dimensional display.
- the display correction unit 61 fades out the luminance of the backlight 7 to gradually reduce the luminance of the backlight 7 and gradually changes from the black state when the screen is changed to the black state. It may be configured to be able to realize a fade-in that increases the luminance of the backlight 7 and returns it to the original luminance.
- the display correction unit 61 may be configured to perform only one of fade-out and fade-in.
- the black state is not only when the backlight 7 is completely turned off, but also when the backlight 7 is not visible to the extent that the luminance change of the main panel 2 is not visible when switching between the two-dimensional display and the three-dimensional display. This includes the case of reducing the brightness of the.
- the luminance of the main panel 2 caused by the operation of the liquid crystal of the switch panel 3 is reduced by reducing the luminance of the backlight 7 when switching between the two-dimensional display and the three-dimensional display.
- the change of was made invisible. Accordingly, it is possible to prevent a change in luminance that causes a viewer to feel uncomfortable on the display screen when switching between the two-dimensional display and the three-dimensional display.
- FIG. 15 shows a schematic configuration of a switch panel of the liquid crystal display device according to the fourth embodiment.
- the configuration of the switch panel is different from the configuration of the first embodiment described above. In the following description, only different parts will be described, and description of parts common to the configuration of the first embodiment will be omitted.
- the switch panel 101 has a pair of substrates 102 and 103 facing each other, and a liquid crystal layer 104 is provided between the substrates.
- a liquid crystal layer 104 is provided between the substrates.
- two first electrodes 105 and 106 are formed on the surface on the liquid crystal layer 104 side with a gap 110.
- a second electrode 107 is formed on the surface on the liquid crystal layer 104 side.
- liquid crystal molecules are arranged in the liquid crystal layer 104 in accordance with the electric field.
- a so-called liquid crystal lens is formed in which the phase change of the incident light differs depending on the position in the surface direction of the panel.
- the switch panel 101 By configuring the switch panel 101 as described above, when an electric field is applied to the liquid crystal layer 104, a part of the liquid crystal layer 104 functions like an optical lens. Accordingly, the right-eye image and the left-eye image are displayed on the switch panel 101, and the liquid crystal layer 104 functions as an optical lens, whereby the left-eye image on the main panel 2 is displayed on the left eye by the liquid crystal layer 104. In addition, the image for the right eye of the main panel 2 can reach the right eye. Thus, the switch panel 101 allows the viewer to visually recognize the binary image displayed on the main panel 2 as a three-dimensional image.
- the image on the main panel 2 can be viewed as it is as a two-dimensional image.
- the configuration of a three-dimensional display device including such a liquid crystal lens is the same as that of a general device, and thus detailed description of the configuration is omitted.
- the thickness of the liquid crystal layer 104 of the switch panel 101 is larger than that of the liquid crystal layer of the switch panel displaying the stripe image as in the first embodiment. It will be much larger. Therefore, the switching time until the orientation of the liquid crystal molecules is switched in the liquid crystal layer 104 of the switch panel 101 is longer than that in the configuration of the first embodiment. Even in such a configuration, by applying the configuration as in Embodiments 1 to 3 described above, it is possible to reduce the luminance change of the display screen when switching between the two-dimensional display and the three-dimensional display.
- the configurations of the above-described first to third embodiments are applied to the liquid crystal display device including the switch panel 101 that configures the liquid crystal lens.
- a TN liquid crystal panel is used as the switch panel 3.
- the switch panel may be an STN liquid crystal or another type of liquid crystal panel, and may be a panel having any configuration as long as it can be switched between two-dimensional display and three-dimensional display. Good.
- a liquid crystal display device is targeted.
- this is not restrictive, and other display devices such as an organic EL may be used.
- the main panel is comprised by organic EL, this main panel itself serves as a light source part.
- the display device according to the present invention can be used for a display device including a switch panel that can switch an image display between a two-dimensional display and a three-dimensional display.
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Abstract
Description
(全体構成)
図1に、本発明の一実施形態に係る液晶表示装置1(表示装置)の概略構成を示す。この液晶表示装置1は、複数の部材を厚み方向に重ねることによって形成される。具体的には、液晶表示装置1は、画像を表示するメインパネル2と、スリット状の白黒画像(ストライプ画像)を表示するスイッチパネル3と、該メインパネル2及びスイッチパネル3を間に挟むように配置される3枚の偏光板4,5,6とを備えている。また、液晶表示装置1はバックライト7を備えている。
上述のような構成の液晶表示装置1において、メインパネル2の画像を3次元画像として視認させる場合、上述のように、スイッチパネル3にストライプ画像を表示させて、右目用の画像は右目のみに、左目用の画像は左目のみに見えるようにする。そうすると、スイッチパネル3に表示されたストライプ画像によってバックライト7の光の一部が遮られる。これにより、視認側から見たときのメインパネル2の輝度が、スイッチパネル3にストライプ画像が表示されていない場合に比べて低下する。すなわち、視認側から見たときに、液晶表示装置の表示画面(最も視認側に位置する画面)の輝度は、2次元表示の場合に比べて3次元表示の場合の方が小さくなる。そのため、液晶表示装置の画像の表示を、2次元表示と3次元表示とで切り替える際に、表示画面の輝度が変化して、視認者が違和感を覚える場合がある。
以上より、本実施形態では、2次元表示と3次元表示との切替の際に、表示画面の輝度変化が2次元表示の場合と3次元表示の場合とで小さくなるように、バックライト7の輝度を変化させた。これにより、2次元表示の場合と3次元表示の場合とでメインパネル2及び表示画面の輝度が変わるのを防止できる。
図10に、実施形態1の変形例を示す。この変形例の構成は、輝度の補正を、表示画面の輝度に応じて行う点で上述の実施形態1の構成とは異なる。以下の説明において、上述の実施形態1と同一の構成には同一の符号を付して、異なる部分についてのみ以下で説明する。
図11に、実施形態2に係る液晶表示装置において、2次元表示と3次元表示との切替の際に生じるメインパネル2の輝度変化の違和感を低減するための構成を示す。液晶表示装置の基本的な構成は、上述の実施形態1の場合と同様なので、液晶表示装置の構成についての説明は省略する。
以上より、この実施形態によれば、2次元表示と3次元表示との切替の際に、不自然なメインパネル2の輝度変化がなくなるまでの間(所定期間)、画像を黒表示にした。これにより、2次元表示と3次元表示との切替の際に、視認者が、違和感を覚えるような輝度変化を視認するのを防止できる。
図13に、実施形態3に係る液晶表示装置において、2次元表示と3次元表示との切替の際に生じるメインパネル2の輝度変化による違和感を低減するための構成を示す。この実施形態の構成は、上述の実施形態2における表示制御部がバックライト制御部となり、バックライトの輝度によって黒状態を実現した点で、実施形態2の構成と異なる。よって、液晶表示装置の基本的な構成は、上述の実施形態1の場合と同様なので、液晶表示装置の構成についての説明は省略する。また、上述の実施形態2の構成と同様の部分は、同一の符号を付して、その説明を省略する。
以上の構成により、本実施形態では、2次元表示と3次元表示との切替の際に、バックライト7の輝度を低下させることにより、スイッチパネル3の液晶の動作に起因するメインパネル2の輝度の変動を視認できないようにした。これにより、2次元表示と3次元表示との切替の際に、表示画面で、視認者に違和感を与えるような輝度変化が生じるのを防止できる。
図15に、実施形態4に係る液晶表示装置のスイッチパネルの概略構成を示す。この実施形態4の構成は、スイッチパネルの構成が上述の実施形態1の構成とは異なる。以下の説明では、異なる部分のみを説明し、実施形態1の構成と共通の部分は説明を省略する。
以上より、本実施形態では、液晶レンズを構成するスイッチパネル101を備えた液晶表示装置において、上述の実施形態1~3の構成を適用した。これにより、2次元表示と3次元表示との切替時間が長いスイッチパネル101の構成においても、2次元表示と3次元表示との切替時に視認者に違和感を与えるような表示画面の輝度変化が生じるのを防止できる。
以上、本発明の実施の形態を説明したが、上述した実施の形態は本発明を実施するための例示に過ぎない。よって、本発明は上述した実施の形態に限定されることなく、その趣旨を逸脱しない範囲内で上述した実施の形態を適宜変形して実施することが可能である。
Claims (11)
- 画像を表示するメインパネルと、
前記メインパネルに対向して配置され、前記メインパネルに表示される画像を2次元画像として視認させる2次元モードと、前記画像を立体的に視認させる3次元モードとに切替可能なスイッチパネルと、
前記スイッチパネルによるモード切替の際に前記メインパネルの輝度を変更する輝度制御部と、
前記スイッチパネルによるモード切替の際に、前記メインパネルの輝度変化を視認側で視認しにくくする視認修正部とを有する、表示装置。 - 前記視認修正部は、前記スイッチパネルによるモード切替の際に前記メインパネルの輝度変化が視認側から視認されにくいように、該メインパネルの輝度を変化させるように構成されている、請求項1に記載の表示装置。
- 前記メインパネルに対して光を出射する光源部をさらに備えていて、
前記視認修正部は、前記光源部の輝度を変化させるように構成されている、請求項2に記載の表示装置。 - 前記視認修正部は、前記スイッチパネルによるモード切替の際に視認側から視認される表示画面の輝度が一定になるように、前記メインパネルの輝度調整を行うように構成されている、請求項2または3に記載の表示装置。
- 前記視認修正部は、
周囲温度を検出する温度検出部と、
前記メインパネルの輝度を周囲温度に応じて補正するための補正値が記憶された補正値記憶部と、
前記温度検出部で検出された周囲温度に応じて、前記補正値記憶部に記憶された補正値を読み出すとともに、該補正値を用いて前記メインパネルの輝度を補正する輝度補正部とを有する、請求項2から4のいずれか一つに記載の表示装置。 - 前記視認修正部は、
表示画面の視認側の輝度を検出する輝度検出部と、
前記輝度検出部によって検出された輝度に基づいて前記メインパネルの輝度を調整する輝度調整部とを有する、請求項2から4のいずれか一つに記載の表示装置。 - 前記視認修正部は、前記メインパネルの輝度変化が視認側から視認されにくいように、該メインパネルに表示される画像の階調を変化させるように構成されている、請求項1に記載の表示装置。
- 前記視認修正部は、前記スイッチパネルによるモード切替の際に、前記メインパネルの輝度変化を視認側から視認されないように、表示画面を黒状態に変更するように構成されている、請求項2、3、6のいずれか一つに記載の表示装置。
- 前記視認修正部は、表示画面を黒状態にする際に、前記メインパネルの輝度を徐々に小さくして前記表示画面を黒状態にした後、該メインパネルの輝度を徐々に大きくするように構成されている、請求項8に記載の表示装置。
- 前記スイッチパネルは、液晶層と、該液晶層を挟み込むように配置される一対の電極とを備えている、請求項1から9のいずれか一つに記載の表示装置。
- 前記スイッチパネルは、前記一対の電極に電圧を印加した際に前記液晶層が液晶レンズとして機能する、請求項10に記載の表示装置。
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AU2011346458A AU2011346458A1 (en) | 2010-12-24 | 2011-12-16 | Display device |
SG2013048921A SG191344A1 (en) | 2010-12-24 | 2011-12-16 | Display device |
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CN106710531B (zh) * | 2017-01-19 | 2019-11-05 | 深圳市华星光电技术有限公司 | 背光控制电路及电子装置 |
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